Compensating roll drive mechanism



July 25,- 1944. J, JONE$ 2,354,599

COMPENSATING ROLL DRIVE MECHANISM Original Filed May 5, 1957 4 Sheets-Sheet l FlGl.

July 25, 1944. J. L. JONES COMPENSATING ROLL DRIVE MECHANISM Criginal Filed May 5, 1937 4 Sheets-Sheet 2 J. a... JONES COLIPENSATING ROLL DRIVE MECHANISM 4 Sheets-Sheet 3 Original Filed May 5, 1937 RNN QQE

25, 1944. J. .JCNES 2,354,599

COMPENSATING ROLL DPJVE MECHANISM Original Filed May 5, 1937 4 Sheets-Sheet 4 Patented July- 25, 1944 *umreo STATES- PAT ENT orrlce COMPENSATING ROLL DRIVE LIEC HANISM John L. Jones, North mum... Masa, assig'nor to Stockton Profile Gauge Corporation, Lowell,

Mass, a corporation of Massachusetts Original application May 5, 1937, Serial No.

140,998, now Patent No. 2,220,737, dated November 5, 1940.

Divided and this application September 13, 1940, Serial No. 356,591

10 Claims.

may be noted the provision of a compensating roll drive mechanism adapted under automatic control to correct in a relatively simple and eiiective manner both lateral and longitudinal misalignments in moving webs; the provision of a mechanism of the closs described which applies correctlons in a resilient manner to avoid subjecting the web being corrected to tension of web-breaking magnitude; the provision of apparatus of the class described in which the resilience is determined by the tear'st'rength of the web; and the provision of apparatus of this class which is energized fromrotary driving means or the like. Other objects will be in part obvious and in part pointed out hereinafter.

.The invention accordingly comprises the elements and combinations of elements, features of construction, and arrangements of parts which will be exemplified in the structures hereinafter described, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in .which is illustrated one of various possible embodiments of the invention,

Fig. 1 is a diagrammatic side elevation of a press, showing a drive mechanism fora compensating roll;

Fig. 2 is a front elevation of a ratchet drive shown in Fig. 1;

Fig. 3 is an enlarged front elevation of a pawl shown in Fig. 2;

. Fig. 4 is a side elevation of the ratchet driv shown in Fig. 2;

Fig. 5 is an enlarged front elevation of connecting means on the end of a press roll, as found in Fig. 1;

Fig. 6 is an enlarged bottom plan view of the connection shown in Fig. 5;

Fig. '7 is an enlarged cross section showing the manner in which a. drive rod is pivoted in connection with the mechanism of Figures 5 and 6;

Fig. 8 is a top plan view of a compensating roll;

Fig. 9 is a cross section taken substantially along line 9-3of Fig. 8, showing an outside elevation of a dual control arm;

Fig. 10 is a cross section similar to Fig. 9, but showing an alternative position of the control arm;

along line I I of Fig. 8, showing the inside elevation of'said dual control arm:

Fig. 12 is a cross section taken substantially along line |2|2 of Fig. 8, showing the outside elevation ot a simple control arm;

Fig. 13 is .a cross section taken substantially along line |3--|3 of Fig. '8, showing the inside elevation of said simple control arm;

Fig. 14 is a cross section taken on line |4|4 of Fig 9, showing a pivot pin and drive nut; and,

Fig. 15 is a fragmentary rear elevation of the compensating roll of Fig. 8.

Similar reference characters indicate corresponding parts throughout the several views of the drawings.

The present invention is adapted for use with alignment detectors, both lateral and longitudinal, of the stroboscopic type, in'connection with the disclosure made in said Patent No. 2,220,737

l wherein details of the detectors may be found.

The mechanism herein described operates on the selective reception of electrical impulses from one or the other of two sources, in a manner stated in said application.

Referring now more particularly to Fig. 1, numeral 3|! indicates a stationary bracket or similar member that is securely fastened to a press frame. the press cylinder which is arranged to extend through the bracket 3 0. To the end of shaft 3| is made fast a gear 312. Numerals 3|3 and 3 indicate gears that mesh with the gear 3|2, and which are individually freely rotatable on studs 3|5 and 3|6 (see also Fig. 6) mounted in the bracket 3 id. The gears 3|3 and 3 M are of special construction, having diametrical slots 3|! extending across the faces thereof.

As indicated more particularly inFig. 7, the slots 3|! have a T cross section, with the cross bar ofthe T downward. This shape of slots 3|! provides for the accommodation of a bolt 3|8, the head 2l3 of which fits the cross portion of the slot 3|! and is there securely held. The shank of the bolt 3|! receives a collar or hearing member 3|3, which is held in position by a nut 320. Surrounding the bearing member 3| 9 is the suitably recessed end of a link or connecting rod 32I, for the gear 3|3, and ananalogous Fig. 11 is a cross section .taken substantially Numeral 3 indicates the main shaft of solenoid 335.

' ear 346 on the pawl 343 and 4, numeral 323 indicates a jack shaft that is supported shown) at its end in suitable bearings (not 325 which may be located, for example, on an The compression spring 345 normally holds the pawl 343 in such a manner that the projection 344 abuts the side of link 34I. The spring At one end, the shaft 323 carries a"' helical gear .324, which engages ahelical goarextension of the shaft 228 arranged for the drive' i of the longitudinal corrective means on' the comdescribed in said pat- 324 is made fast to the pensating roll of the type ent application. The gear shaft 323.

Numeral 326 indicates a ratchet wheel that normally turns loosely on the shaft 323. Nu-

meral 321 indicates a similar, but oppositely fac ing ratchet wheel that likewise turns freely on the shaft 323. Frictionally engaging the respective outer faces of ratchet wheels 326 and 321 are discs 326A and 321A, which are likewise rotatable on shaft 323. Friction disc, 326A is held firmly against ratchet wheel 326 by a compression spring 328, the other end of which reacts against the inner face of worm wheel 324, while friction disc 321A is similarly held firmly against ratchet wheel 321 -by acompression spring 323, the other end of which reacts against a disc 330 made fast on shaft 323;. The compression spring 328 is secured at its ends to disc 326A and worm wheel 324, and compression spring 323 is secured at its ends to disc 321A andclisc 330. The springs 328 and 323 hold therespective discs 326A and 321A against their ratchet'wheels 326 and 321 so that frictional drive, relationships arehad between ratchet wheel-326' and shaft 323, on the one hand, and ratchet wheel 321 and shaft 323, on the other hand',;but discs-326A and 321A will slip on their respective ratchet wheels before they transmita drive that would tend to jam the shaft 323. These friction discs 323A and 321A may accordin ly be designated .asanti-jamming or overload'devicesc Numeral 35 indicates a loosely swingable on the shaft'323, tioned betweenthe ratchet wheels radial arm that is and is posiszs and 321 but close to the ratchet wheel 326. An analogous arm 332 is positioned next to the ratchet wheel 321. To the end of arm33l is-pivoted, as by a pin 333, the other end of link 32l, while asimilar pin 334 holds the other end'of link ,322 to the outer endof arm 332, On the arm 33! is mounted an electromagnet or solenoid indicated by numeral 335, and a freely swinging armature 336 is articulated to the movable .core, 331 of the- The armature 336 is preferably suspended on a light leaf spring 338, in the manner indicated. The lower end of armature ,336 is connected to a portionindicated by. numeral 333, and the extreme end of portion 333 is pivoted, as by a pin 340, to a short link 34]. The other end of link 34!. rotates about a pivot pin 342 mounted in the arm 33!. Also, rotatably mounted on the pin 342 (see also Fig. 3) is a pawl 343, which has a rearward up-tumed portion 344 adapted to engage the side. of link 3. A compression spring 345 operating between an and an ear 341 on the link 3, tends at'all times to force th'e paw! 343 to' rotate in a counter-clockwise direction, as illustrated in Fig. 3. The lower end 3430! pawl 343 is shaped to engage the'teeth of ratchet wheel 326. 1

338 normally holds the armature 33B away from the electromagnet 335, or, in other words, with the, screen its extended position; This positioni'ng of the armature 336 through the action of the portion 333 on link 34I, normally 'rotates the whole pawl assembly so that it is freeofany engagement with the teeth of ratchet wheel 328.

The arm332 is (provided with a similar assemlbly 01'- elements, including an electromagnet 343,

an armature 350', an armature supporting spring 351, and a pawl 352. These elements numbered 343 through 352, inclusive, all have analogous functions totheir similar elements mounted on arm 33l, but face in an opposite direction and spective' electromagnet,

tently,

engage the ratchet wheel 321.

Electrical connection is made from one of the thyratron sources of said Fig. 13 of said patent application, for example, to the electromagnet 33,5, and from the other thyratron of said circuit of said patent application to the electromagnet 343.

The opera-tion of the drive mechanism as thus described is as follows:

The constantly rotating gear 3|2 constantly rotates the. gears M3 and 314. Links 32! and 322 not; function as connecting rods, and serve to oscillate their respective arms 33! and 332 on the shaft 323. The oscillations of the arms 33I and 332 may be regulated to any desired amount by loosening the nuts 320 and adjusting the position of bolts 3I8 in slots an, as will be obvious from the drawings. As long as no power reaches either of the electromagnets 335 or 343 from the circuit, both pawls 343 and 352 are held out of engagement with their respective ratchet wheels 326 and 321. The arms 33| and 332 thus reciprocate idly on the shaft 32 3'.

' If, now, power'is supplied to either the electromagnet 335 or to the electromagnet 343, the refor example 335, is energized; and in the case of said electromagnet 335, it draws in its core 331, moving the armatures 336 to the left in Fig. 2. Portion 333 of armature 336'then, rotates link 34! to the left, and thus throws the lower end 348 of pawl 343 into engagement-with the teeth of ratchet wheel 326. Whenever, now, the arm 33l enters a counterclockwise phase. of its oscillation, the end 348 of pawl 343 moves against a tooth of ratchet wheel 326 and drives said ratchet wheel in a counterclockwise manner. The clockwise reciprocation of arm 33! is, however, ineffective to rotate the ratchet wheel 326, because, for a relative clockwise rotation of the arm 33l, the compression spring 345 permits the pawl 343 to spring aside over successive teeth of the ratchet wheel 326.

By a similar, but reverse movement, whenever the electromagnet 343 on arm 332 is energized, the ratchet wheel 321 will be rotated, intermitin a clockwise direction, but left free under the back-springing action of the pawl 352,

,under counter-clockwise reciprocations' of the der 12 of the press.

ing roll (not shown) stud 205 against rotation in the arm 204.

22.8 in turn selectively drives the worm 221 which reacts upon sector gear 225 of the frame holding the compensating roller 188.

Returning to Fig. 1, it will be seen that another shaft 353 similar-in all respects to the shaft 323 is provided, and that this shaft 353 carries an assembly of ratchet wheels, reciproeating arms, and the like, all fof.which are analogous to the similar elements provided on shaft 323, -In order to drive the reciprocating arms of the assembly on shaft 353, connecting links 354 and 355 are provided to the ends of the respectivearms 331 and 332 of the assembly on shaft 323.

It will be understood from said patent application that the electromagnets of the assembly on shaft 353 are electrically connected to a lateral alignment detector, whereas the electromag-, nets of the assembly on shaft 323 are electrically connected to a longitudinal alignment detector.

Shaft 353 drives a shaft 35l through a helical gear 356. The shaft 35! s connected through a bracket or arm 204 has at its extreme end a pair 'portions 206 of stud 20s is a collar :08, from which extends a radial arm 209. The roller bearing 191 is mounted atthe far end of arm Referring now to Fig. 9, it will be seen that the of parallel projections 210. On theoute'r faces of the two projections 210 are mounted roller or like frictionless bearing elements 211, and these bearings 211 serve to mount therebetween'a l'ead screw 212, which extends throughv the projections 210 and across the space therebetween, At its lower end, the lead screw 212 is connected by a suitable coupling 213 to a 'flexible shaft 214.

Threaded on the lead screw 2.12 is. a nut 215 which has a cylindrical portion 216 extending inwardly, its axis being parallel to. the axis of the stud 205. 'Portion 216 receives a roller 211, and the roller211 is held in position on the portion 216 by a washer 218 and a screw 219, asindicated in Fig. 14. The roller 21! slides up and down in a slot 220 provided therefor in arm .209. It will now be seen that if the lead screw 212 is rotated, the nut 215 will move up and down said lead screw, relative to the bracket or arm 204, and thatmotion of the nut 215 in the manner described will in turn cause rotation of the flexible drive shaft 214 to a lead' screw 212 opermay be provided for any'or all of the compensating rolls in a press system.

[The compensatorroll 188 operates upon a web W which passes between rollers 11 and 12 and compensation is effected by the mechanism shown in Figs. 8-15 herein.

The compensating roll is shown in Figs. 8-15, to which attention is now directed. Referring to these figurea and more particularly to Fig. 8, nu-

metal 188 indicates the roller just mentioned. The roller 188 is mounted upon a shaft 189, the ends-of which are received in suitable anti-friction bearings 190 and 191 mounted in arms 192 and 193, respectively. -The arm 192 is simplest in construction, and willfirst be described. It comprises a simple radial arm extending from a hub 194 which is secured by set screws 195 to a shaft; 196 which extends the width of the press.

The roller 188, it will be understood, is preferably slightly longer than the width of the ,web. One' end of the shaft 196 is rotatably received in a bearing 19], while the other end is likewise rotatably received in a bearing 198. Shaft 196 has a portion 199 of reduced diameterat the end which enters'the bearing 198.

Both extreme ends of the shaft 196 are. preferably provided with collars 200 through which extend taper pins 201 forholding the shaft 196' against sidewise motion in the bearings 19! and The arm 193 comprises'a collar 202, which is "secured to the shaft 196 by set screws '20:. From the collar 202 extends a bracket or arm 204, in

which is received a stud'205 provided with a bearing surface 206. A screw 20'1 secures the axis of the stud 205 is parallel to the axis of the arm 209 pivoting on stud 205. By way of illustratiori, Figures 9 and 11 show, the relative position of the .arms 204 and 209 when the nut 215 is at the bottom of the lead screw 212, while Fig.

10 shows the relative position of the arms 204 and '209 when the nut 215 is at the top of the lead screw 212. The relative motion of-the roller 188 thus brought about by turning the lead screw 212 is a tilting motion, and results in an adjustment of the angle made by the axis of roll 188 with the axis of shaft 196. When the nut 215 is in its central position on lead screw 212, the arms 204 and 209 are'so positioned, relative to each other, that the axis of the roller 188 is parallel to the axis of shaft 196.

The bearings 190 and 191 for the ends of shaft 189 of roller 188 are purposely made in such a manner as to permit the. tilting of the roller 188 in the manner described; such as self-aligning ball bearings.

Returning again to Fig. 8, it will be seen that the collar 202, and brackets 204, are provided with a forwardly extending flange or collar 221.

Additional set screws 222 aredesirably provided a in the collar-221, for securing the assembly firmly to, the shaft 196. The face of collar 221 re- 'ceives one end of a tension or coil spring 223 that is wrapped around the shaft 195,- The other end of the coil spring 223 is firmly mounted in the face of a collar 224 which rotates upon the portion of reduced diameter 199 of the shaft 186.

- of which is toothed, as indicated at numeral 226 in Fig. 15, .to engage the threadsof a worm wheel 221. The worm wheel 221 is in turn mounted onash ft 228.

Numeral 229 indicates an arcuate slot-that is provided in the collar 224, and'numeral 230-indicates a radial pin that is mounted in 'the'shaft The,

'shaft 196. Rotatably mounted on the bearing 75 Normally, the

pin 230 is positioned to abut the The operation of the compensating roll as thus described is as follows:

The roller I88 frictionally engages the moving web. The bearings I91 and I98 are so positioned that the shaft I96 is supported with the 6 roller I88 in the desired engagement with the web. It will be' assumed, for the moment, that the nut 2I5 is located midway on the screw 2I2.

Assume now that the longitudinal detector calls for a correction in a direction requiring 10 take-up, or tightening of the web W. This means that the shaft of the ratchet motor arrangement will be rotated in a direction tending to rotate the worm wheel 22'! in a clockwise (Fig. direction, thus rotating the sector gear 225 15 also in a clockwise direction. The sector gear will accordingly be rotated as long as longitudinal correction is required. Rotation of the sector gear is transmitted, through the spring 223, to the collar HI, and consequently the'shaft I96 is resiliently driven to rotate. The action of the spring 223 is to introduce resilience into the rotation of the shaft I 96, so that it will not too suddenly rotate and possibly thereby break the moving web of paper. Ultimately, the spring 223 will rotate the shaft I96 sufficiently far so that pin 23!! is brought to abut the end of slot 229. In rotating, the shaft I96 carries with it the arm I92 and the now relatively rigid'assembly comprising arms 204 and 209, and thus shifts the 3 roller I88 downwardly with its axis remaining parallel to the axis of shaft I96, to take up web material and hence to retard, relatively, the progress of the web and thus achieve a desired longitudinal correction.

If the longitudinal detector calls for a correction in the. opposite direction, namely, requiring ..a loosening, or relative advancement, of the web,

then the shaft of the ratchet motor arrangement will be rotated in a direction tending to rotate worm wheel 22'! in a counter-clockwise (Fig. 15) direction, thus rotating the sector gear 225 also in a counter-clockwise direction. Rotation of the sector gear 225 is now directly transmitted to shaft I96 by-the abutment of pin 230 on the end of arcuate slot 229 (the normal position of pin 229). Resilient drive of the shaft I96 is not now needed, because the corresponding upward shifting of roller I88 tends to relax tension on the web W, rather than to increase such tension, and hence there is present no tendency to break the web W. The upward movement of roller I88 loosens the moving web W and hence relatively advances it in its longitudinal travel.

Lateral adjustment is accomplished through rotation of the lead screw 2I2, as above described. causing the nut 2I5 to move up and down with relative rotation of the arm 299 on bracket 20 3. The net result of this movement is to tip or tilt 6 the axis of rotation of the roller I88. By tilting the roller I98, the direction in which the web is proceeding is altered, and by altering thisdirection, the lateral misalignment is corrected. If the direction of lateral misalignment is against the travel of the web, the extra pressure on the web resulting from the correcting tilting of the roller I88 is temporarily transferred to spring 223, by the reaction through pin 230 in its normal position of rest against the end of arcuate slot 229. In a brief time, however, spring 223 returns to its present position, thus applying the full lateral correction required in a resilient manner. The correction of a lateral misalignment with the directionof travel of the web relieves normal web tension, and hence no resilient application of the correction is needed.

After a lateral correction the roller I86 usually remains in a tilted position, and when a longitudinal correction is then needed, it is applied in the same manner already described, the effect of the applied longitudinal correction still being to shift the roller I88 as a whole, keeping its axis of rotation parallel. Obviously, therefore, a longitudinal correction may be accomplished without introducing, thereby, a lateral misalignment,

and .vice versa.

It will accordingly be seen that a compensating roll of great compactness and eflicient operation is provided, for operation in conjunction with the misalignment detectors, both lateral and longitudinal, heretofore described.

It will be noted that in effect the gear 3I2 is synchronized with-the cylinder II and that the same compensating effects could be obtained by driving the ratchet mechanism from a similar gear which, instead of being driven by the cylinder II, could be driven by a separate motor synchronized with the cylinder II. This is-mentioned to indicate what would be considered to be one of the possible mechanical equivalents which might be used.

In view of the above, it will be seen that the several objects of the invention are achieved and 0 other advantageous results attained.

As manychanges could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings'shall be interpreted as illustrative and not in a limiting sense.

I claim:

1. A compensator for a moving web which passes over rotary cylinders comprising a roller 0 on the web for displacing the web, a, swinging frame supporting the roller, drive means for biasing the roller in the frame, drive means for swinging the frame, separate ratchet means in each of said drive means, a pair of pawls associated with the respective ratchet means adapted selectively to drive the ratchet means in one or the other direction, oscillating means for the ratchets operating the respective ratchets of each pair in opposite directions, means for driving the oscillating means synchronously with said cylinders, means for normally retracting 'said pawls from their ratchets, and means for selectively forcing the pawls toward engagement;

2. A compensator for a moving web comprising a roller on the web for displacing the web; a swinging frame supporting the roller drive means for biasing one end of the roller in the frame, drive means for swinging the frame, separate ratchet means in each of said drive means,

0 a pair of pawls associated with the respective ratchet means adapted selectively to drive the ratchet means in one or the other direction, 05-- cillating means for the ratchets, means for driving the oscillating means, said pawls normally being retracted from their ratchets, and means for selectively individually forcing the pawls toward engagement.

3. Adjusting means for elevation and tilt of a roller comprising separate ratchet means respectively for elevation and tilt, a pair of pawls for .each ratchet means, separate oscillating means for the respective ratchet means of each pair, means for driving said separate oscillating means which are oppositely phased to provide opposite movement, corresponding members of both pairs connected with the: oppositely phased pairs of of ratchet means being mechanically connected to a given driving means for similarly phased movement, means normally biasing the pawls away from their ratchet means, and'means for selectively moving them against the respective ratchet means.

4. A compensator for a moving web which passes over a rotary cylinder, comprising a roller on the web for displacing the web, a swinging frame supporting the roller, a first drive means for swinging the frame, a second drive means for biasing the roller in the frame, a reversible ratchet means in each driving means, a pair of independently swinging "arms associated with each ratchet, eccentric means driven by the roranged for driving the respective ratchetmeans in opposite directions, and means on the respective arms for controlling the respective ratchet means thereon for connection and disconnection from the ratchet means, the controlling means on oppositely chased arms being independent.

5. A compensator fora moving web which passes over a rotary cylinder, comprising a roller onthe web for displacing the web, a swinging frame supporting the roller, a first drive means for swinging the frame, a second drive means for biasing the roller in the frame, a reversible ratchet means in each driving means, a pair of independently swinging arms associated with each ratchet, two independently adjustable eccentric means geared to the rotary cylinder, connecting rods respectively connected between the eccentric means and each of a pair of said radial arms which are associated with oneofthe eccentrics', the eccentrics being angularly phased with respect to one another, whereby said radial arms are oppositely phased, means respectively linking members of one pair of radial arms with the members of the other pair of radial arms in equal phase relationships, a pawl mechanism on each arm, the pawl mechanisms on oppositely phased arms being arranged fordriving the respective ratchet means in opposite directions, and means on the respective arms for controlling the respective ratchet means thereonfor connection and disconnection from the ratchet means, the controlling means on oppositely phased'arms being independent.

6. A compensator for a moving web which passes over a rotary cylinder, comprising a roller on the web for'displacin the web, a swinging frame supporting the roller, drive means biasing the roller in the frame, separate driving means for respectively swinging the frame and biasing the roller in the'frame, separate ratchet means in the respective drives, levers adjacent the respective ratchet means in the respective drives equally phased and of equallength, said levers being connected by a connecting rod, a pair of oppositely phased levers respectively adjacent levers, means for driving said eccentric means from the rotary cylinder,'forward and reverse pawls on the respective levers selectively en- .gageable with the ratchet means forforward or reverse movement of said ratchet means, each pawl being operable independently of the other.

7. In a, web compensator, a ratchet Wheel, an oscillating leveradjacent to the wheel, an electromagnetic coil supported on the lever for movement therewith, an armature having relative movement with respect to said coil and operative thereby, means for mounting said armature on the lever comprising a spring fixed to the lever on the one hand and to a movable member supporting the armature on the other hand, a pawl pivoted to the oscillating lever, and means connecting said armature-supporting member '25 mechanisms onoppositely phased arms being arsaid ratche't means also of equal length and between themselves 'being equally phased, said lastnamed levers also being connected by means of a, connecting rod, and separate eccentric means and the pawl for operating the latter.

8. In a web compensator, a ratchet wheel, an oscillating lever adjacent to the wheel, an electromagnetic coil supported on the lever for movement therewith, an armature having relative movement with respect to said coil and operative thereby, means for mounting said armature on the lever comprising a spring fixed to the lever on the one hand and to a movable. member supporting the armature on the other hand, a pawl pivoted to the oscillating lever, and means connecting said armature-supporting member and the pawl for operating the latter, said lastnamed means-comprising a link pivoted adjacent to the pawl, spring means reacting between the link and the pawl normally biasing the latter toward the ratchet wheel in one position of the link, a dog on the ratchet engageable by said link for retraction of the pawl from the ratchet in another position of said link, and a connect-. ing rod between the link' and said armaturesupporting member.

9. A compensator for a moving web which passes over rotary cylinders, comprising a roller on the web for displacing the web; a swinging frame supporting the roller, a bearing at one end ofthe roller and the frame permitting tilting of the roller, a bearing at the other end of the roller, a swinging arm pivoted to the frame frame supporting the roller, a bearing at one end of the roller and the frame permitting tilting of the. roller, a bearing at the other end of the roller. a swinging arm pivoted to the frame and supporting said other bearing, a mechanism carried on the frame and cooperating with the arm to adjust the arm whereby the roller is tilted from its end carried in the arm, a shaft.

I said frame oscillatin around the center line of the shaft, rotary means for oscillating the frame,-

resilient means connecting said rotary means and the frame, and a flexible driving means for transmitting motion to the arm-adjusting means in any position of the frame around the center JOHN L. JONES. 

